Analysis of Static Load Variation on the Structural Strength of the Polbeng 2 Engine Foundation Using the Finite Element Method

Abstract

The engine foundation plays a critical role in maintaining the alignment, stability, and operational performance of a vessel's propulsion system. The Polbeng 2 training vessel underwent a main engine replacement from 71 HP to 15.78 HP, resulting in changes to the structural load transmitted to the foundation. This study aims to analyze the effect of static load variation on the strength and deformation of the Polbeng 2 engine foundation using the Finite Element Method (FEM). The 3D foundation model, initially designed with fiberglass material, was developed in Rhinoceros software and analyzed using ANSYS Student with static structural simulation. Two loading scenarios were evaluated: the initial engine load of 5560 N and the reduced load of 1815 N. Simulation results show a decrease in maximum Von Mises stress from 0.04 MPa to 0.016 MPa following the load reduction, accompanied by a proportional reduction in deformation. These results indicate that the modified engine foundation remains structurally safe under the new load conditions, demonstrating adequate strength and stiffness performance. This study highlights the importance of FEM-based assessment in ensuring design reliability during machinery replacement on training and operational vessels.